Time mechanism



J. L. HARRIS TIME MACHANISM Sept. 4, v1945.

Original Filed Dec. 30; 1939 4 Sheets-Sheet 1 l v .//4 l 1551// 1/////////// I l Il. l l I 1 f Chong Sept 4 1945- K J. l.. HARRls 2,384,373

`TIME! MACHANISM Original Filed Dec. 30, 1959 4 Sheets-Sheet 2 J. L. HARRIS TIME MACHANISM Sept. 4, 1945.

4 Sheets-SheetP 3 Original Filed Dec. 30, 1939 ,numfor f rfa/1w L. Mawr/3.

Sept. 4, 1945. J. L. HARRIS 2,384,373

TIME MACHANISI' original Filed Dec. s, 1939 4 Sheets-Sheet 4 'Umzug lill detailed rsanaassse 4, 194s :stem

TIMEMECHANISM John L. Harris, milwaukee, wia.' adgnor te Minneapolis-Honeywell Regulator Company, Minneapolis, Minn., a corporation of Delaware Original application December 80. 1939, Serial No.

311,799, nowlatent No. 2.341.714, dated Febs'lary 15, 1944. Divided and1 December 81, 1942, Serial No. 4 0.191 f (ci. m-r) 6 Claims.

'I'he present application isa division oi my copending application Serial No. 311,799, tiled December 30, 1939, now Patent No. 2,341,774, for vimprovements in Time mechanisms.

My invention relates to improved forms of electrically driven timing devices and their comblnation with thermostats or the like and switches.

An object of my invention is the provision of 'an improved form of electric motor driven time controlled device embodying a novel and simpliiiedspeed reduction mechanism.

Another object o! my invention is the provision ofy a novel speed reducing mechanism embodying relatively few parts, occupying a minimum ofA space and yet capable of eii'ectlng an unusually great speedreduction.

VAnother object oi my invention is to provide a speed reduction mechanism embodying gears driven at diiierent speeds and reciprocatory mechanism arranged to be operated through one cycle in a time interval depending on the diilerence in speeds of the gears.

Another object of my invention is to make possible the construction of a time controlled thermostat in a smaller size and in more compact and convenient form.

Another'obje'ct of my invention is to provide a time controlled thermostat employing my improved gear reduction mechanism wherein the timing mechanism is mounted behind .the thermostatic element, and may in one form oi the invention be in a recess in the wall so that the instrument has an apparent sire no larger than ordinary thermostats.

Another object is to provide a time controlled thermostat having day and night settings and manual adjustments for both settings, themanual adjusting means for both settings comprising rotatable elements having cam surfaces with an adjusting lever extending to a positionbetween the cam surfaces so that it can be adjusted from one to the other.

Figurel is a iront exterior o! a time-controlled thermostat embodying my invention:

Figure 2 is a cross sectional side view o! the complete assembly o! the thermostat and timing mechanism:

Iigureaisaview oithemotorandpartoithe gear train of the timing'unit; y

Figure 4 is a sectional view taken along line 4-4 of Figure 2;

Figure 5 is an exploded view of manual adjusting means for adjusting the times at which the timing means automatically adjusts the thermot; v l staFigure 6 is a view oi the day cam shown in Figure 5:

Figure 'I is a cross-sectional view o! a complete assembly of another io'rm of my invention; Figure 8 is a view of another embodiment oi my invention incorporated in a time clock, this view being .taken along line 9 9 oi Figure 9;

Figure 9 is a view taken along llneH of Figure 8; g l

Figure l0 is a view of a form which the timing motor unit; of my invention may take. this view being taken along line Il-il oi' Figure '11; l

Figure i1 is a cross-sectional view oi a clockl utilising the timing motor unit o'iligure 10, the viewoi the timing motor unit being taken along. line Ii .-II of Figure 1i);- y

Figure 12is a view of another embodiment of my invention. applied to a switch. this view he- `Another object or my invention is to provide a clock mechanism embodying a speed reduction arrangement wherein two gears are .driven at diiierent speeds and a reciprocatory element is moved an amount depending on the'diiierence in speeds oi the gears. the-reciprocatory element y cooperating with pawl and ratchet means to turn a time indicating rotary member.

Numerous other objects and advantages oi my invention will become apparent from the followdescription and annexed drawings wherein: v

ing taken along line i2-i2 of Figure 13, and

Figure i3 is a side view o! the t oi Fillile 12. U; v

Referring to the drame, Figure l `is a front view of a time controlled thermostat, numeral Il designating generally a casing enclosing the thermostatie member and thetiine clock. nie casing ill comprises a rear portion Il having openings for air circulation and inwhich the timing mechanism is located and a front portion i! (see Figure 2) which enclom the thenncstatic mechanism. The casing il has a portion Il torming' a panel having a slot I4 therein and an The edges oi the slot i4 are graduated in degrees oi temperature and within lthe portion l2 in line with the slot il there is a mer- 'cury thermometer as shown held in position by suitable clips. vA timing dieall Il: is visible through the opening il in the pan 'I 'he portions il and I2 of the casingl il ne separated by a VpanelI l1, the lower portion of which is bent ata right angle as seen at Il, the

. casing Il beingremvlbly secured t0 this pltlon by screw 9. There is an opening in the ccn` tral portion of the panel I1 and the edges of the material of the panel I1 around -this opening are flanged so as to form a continuous shoulder around the opening. In interfltting engagement with this shoulder so as to cover the opening in the panel I1 is a piece of insulating material I2 which is attached to the panel i1 by means of rivets or the like.

'I'he thermostatic mechanism comprises a U- shaped bimetallic element 20, one end of which is attached by riveting or the like to a support ing bracket 2i, one end of an adjusting lever 22 being attached also -to the bracket 2i between the bracket and the end of the thermostatic element. At the other end of the thermostatic element there is attached by riveting or the like a contact bracket 22 carrying an electrical contact 24. Also attached to this end of the thermostatic element is a rigid stop or backing member 25 for the contact bracket, the lower end of the backing member 25 being bent up in the form of a U as shown to limit leftward movement of the contact bracket 22. The bracket 2i is carried on a pivot 22 which is journalled vin ears extending out from the material of the panel i1. Numeral 21 designates a exible leaf spring one end of which is attached to the bracket 2i by riveting or the like and the other end of which has an ear 22 engaged on a pivot pin 29 extending through a similar ear forming part of the material of the panel I1. The leaf spring 21 continuously urges the bimetal element 25 in a clockwise direction about the pivot pin 25. Numeral 22 designates a contact bracket formed integrally with the panel I1 and extending downward, this bracket carrying a contact screw 2l which is in a position to be engaged by the contact 24. The upper end of the bracket 2i is bent as shown at 22 and attached to the bracket 2i near its upper end is a metal strip 22, this latter strip and the bent portion 22 of bracket 2i taking relative poitions whereby to be actuatable by manual adjusting means for the thermostatic mechanism.

Referring now to the manual adjusting means, numeral 24 designates a shaft passing through a bearing 24a mounted in the panel I1. Attached to the left end of the shaft 24 is a day dial 25 graduated in degrees of temperature, this dial also being visible on Figure 1. Numeral 22 designates a bracket through which the shaft 24 passes, the bracket having an ear or projection extending through the panel I1, this bracket additionally serving as a support for the shaft 24 and having a prong or finger 21 extending through an arcuate slot 22 in the dial 25, the ringer 21 serving as a stop to limit rotation of the filial 25 in one direction or the other. Numeral 22 designates a spider having a plurality of ilexible arms, this spider being interposed between the bracket 22 and the upper part of the panel I1 and acting to urge the dial 25 and shaft 24 in a leftward direction. Secured to the right end of the shaft 24 is a rotatable cam member 42 which may be made of plastic material and which has a cam surface 4I which is arranged to be engaged by the bent portion 22 of the bracket 2i at certain times. Rotatably engaged on the shaft 24 to the left of the member 42 is a rotatable cam member 42, this member having a night dial portion 42 and a portion-44 forming a cam surface adapted at times to be engaged by the upper end of the metal strip 22. The upper portions of the dials 42 and 25 extend through openings in the casing I2 as shown. Interposed between the rotatable member 42 and the bearing 24a is a spider 45. Numeral 42 designates a stop pin extending to the right from panel i1, its end being situated in an arcuate slot in the rotatable member 42 and serving to limit rotation of this element in one direction or the other. Numeral 41 designates a pointer formed of the material of panel I1 and extending upwardly and having an index marker thereon arranged to cooperate with the graduations on the dials. It lwill be under stood that the flexibility of the spider 22 urges the dial 25 to the left andvconsequently causes the shaft 24 to maintain the rotatable members 45 and 42 in their proper respective relative positions. With the parts in the position shown, the strip 22 is engaging the cam surface 44 of rotatable member 42 and thus when the night dial 42 is manually adjusted the cam surface will act on the strip 22 and will adjust the position of the thermostatic element 22 about its pivot 22. As will be pointed out later, the thermostatic mechanism may be so positioned that the bent portion 22 of bracket 2i may be brought into engagement with the cam surface 4I of rotatable member 42 so that the position of the thermostatic element may be adjusted by adjusting the day dial 25.

The timing mechanism which I employ for automatically adjusting the thermostatic mechanism will nowbe described. In Figure 2 the timing mechanism as shown includes an electric motor designated generally at 55, this motor unit being also shown separately in Figure 3. 'I'he motor unit comprises windings 5i and a more or less oval shaped core 52 as may be best seen in Figure 3. The core has portions 52 and 54 forming pole pieces disposed on opposite sides of a rotor 55. Numeral 52 designates a rectangular bracket secured to the core 52 by screws, this bracket serving as a bearing to support one end of `a shaft 51 on which the rotor 55 is mounted. The other end of the shaft 51 is supported in a needle point jewel bearing 52, the jewel being mounted in the core 52. The motor is of the mag netic type and the pole pieces and rotor each have such relative numbers of teeth so as to cause the motor to rotate lat a speed of 360 revolutions per minute when the windings 5I are energized with 60 cycles alternating current.

The motor unit 52 is of the self starting type. the starting mechanism includinran armature 22, within the windings 5|` The armature 22 is. attached to a bell-crank lever 2i which is pivoted to an ear forming part of a bracket 22 secured to the core 22 by means of screws. The other enc' of the bell-crank lever 2i engages a hook 42 or.. the upper end of a member 24 having an ear 24 adapted to engage the teeth on the rotor 55 when the member 24 is moved vertically. Thus when the windings 5I are energized, the armature 2s is moved to the left and the bell-crank lever 2l is operated in a direction to move the member 2l downwardly whereupon the ear 25 in moving tc the position shown in Figure 2 engages one of the teeth of the rotor 55 so as to start the moto: Upon deenergizatlon of the windings 5I the mem ber 24 moves upwardly to be in position for the next starting operation. Numeral 22 designates a guide for the member 24 and numeral 21 designates a stop to limit movement of the bell-crank lever 2|.

Mounted on the shaft 51. is a worm gear 22 which drives a pair of gears 22 and 12 as may be seen in Figure 4. The gears 22 and have differassasrs teeth. Secured to the central portion of the gear u is e cup 1| and secured to the central portion of the gear Il is a disc member 12 having a hear-v ing portion, the cup 1I and bearing portion of disc 12 serving as means for mounting the gears Il and 1l on a shaft 1I. 'I'he left end of the shaft 13 forms a needle point mounted iny a bearing in a bracket 1t secured to the core I2 by screws as shown. #The right end of the shaft 13 also forms a needle point engaged in a bearing in a metal bracket Il attached to the panel I1 by a screw and depending therefrom adjacent the opening in4 the panel I1.` Rotatably mounted on the shaft 1I is a collar` 1t having a portion of smaller diameter so that a shoulder is formed bythis portion and the other portion of the collar. The collar 1tissecuredtothedisc12byapin1lsoasto rotate therewith. YFrictionally engaged within the cup 1I is a cam 1l having a helical surface which continuously engages a cam follower in the form of apin or rod 1l which is attached to the collar 16 and which extends through the disc 1I. Cam 1l has one abrupt drop of! which is at the top of the cam as seen on Fig. 4. From the foregoing it will be understood that by reason of the gears Il and 10 having .different numbers of teeth that they rotate at slightly different speeds and therefore by reason of the different speeds there will be a relative amount of motion between cmn 1l and cam follower 10 dependent on the difference having Il and Il teeth, respectively. there will be engages the portion of cam. 1I permitting movement to the left, the sp member II acting through member Il forces the collar 1 6 to the left. and causes the finger Il to be withdrawn from the ratchet whee Il for the next cycle of operation. At this time. the member Il dlsengases stop il. Thus for each cycle of axiall movement of the collar 1I vto the ratchet wheel II is advanced one tooth and therefore if this ratchet wheel is provided with 00 teeth. for example, the total speed reduction provided is 6480 80 or 518,- 400 to one.

The shaft I1 is supported in a bearing Il and in a bearing formed In a bracket Il. the bracket Il having a horizontal portion as seen in Figure 2 and upstanding portions which may be fastened to the panel I1. To the right of the bracket Il, the shaft I1 Is secured to a collar Il by any suitable means and the collar is'secured to the time dial Ilbymeansofascrew".

With the shaft l1 vrotating at a speed 0f 3.60

` revolutions per minute and with a speed reduction tion every twenty-fourhours. The time dial Il has half of its surface light and graduated to designate times from 6:00 a. m. to 6:00 p. m., and

:ill

one revolution of one gear with respect to the other for every 6480 revolutions of the motor shaft u. In other words, for every so revolutions or the shaft l1 there will be one. revolution of the cam 1l relative to the follower 1l and hence there will be one cycle of axial movement ofthe collar I6 for every 6480 revolutions of the shaft I1.. it being understood of course that the action of the cam 1s on the follower 1l is to reciprocate the collar 1l on the shaft 1f by reason of the helical surfaceof the cam 1l, collar 1I normally being urged to the left aswill presently be described and abruptly moving to the leftwhen the cam follower drops off the drop oil' on cam 1l.

The portion of the collar 16 of smaller diameterV extends through an opening in a member II.

' which member is fastened to the panel I1 4lay means" of a resilient bracket or spring member Il'.A

The opposite end of the member Il is bent-over slightly and normally' engages a stop l2 on the panel`I1. Thereare a pair` of II which extend to the left as seen the inner edges of the "opening Il and which are adapted to be shoulder. of collar 1l when the collar to the right as seenin Figure 3. 00 also has a finger or projection Il tends to the right through the opening panel lII as may best be seen on Figure 4. linger Il is in enect a pawl which engages ratchet wheel Il mounted on -a shaft Il.

Prom

the stop "with the spring member Il flexing. When this action occurs. the finger or pawl Il moves downwardly as seen on Figure 4, engages the ratchet wheel I6 and rotates it in a direction which would be counter-clockwise looking at Figure 4 from the right. Whenthe cam follower 1l ments being relatively adjustable with respect to 'lit has the other half of its surface dark and graduated to designate times from 6:00 p. m. to 6:00 a. m. The instrument of Figure 1- therefore indicatesatime of 10:00 p. m. f

AThe purpose of'tbe timing mechanism is to automatically adjust the setting of the thermostat. .Secured on the shaft I1 adjacent a collar l2 is a time disc or dial n. There are also mounted on shaft I1 a pair of segmental elements I4 and Il having cam surfaces, the segmental elethe disc Il. For a better understanding of the elements. being described, reference may be had to Figure 5 which is an exploded view of these elementsandthetimedial l0. n

As may be seen on Figure 5, the segmental elements u and Il have flanges at their peripheries which form'their' respective cam surfaces, the cam surface of element Il overlapping the cam surface of the element Il as may be seen on Figslot Illinthediscll.therealsobeingasmall washer on screw Il for properlyspacing the element .Il and disc I8. 'Ihe disc has half ofits surface shaded and the other half unshaded `and is graduated in a manner similar to thatofthe dial II. the shaded half of disc I represent- 6:00 p. m. to 6:00 a. m` and the tho of :00 In. t0 6:00 p. m. The elements I4 and 0I are ustable on the shaft I1 by means of looseningthejespective thumb screws t1 and tl.

elements caribe adjusted. l

6114118 to Figures 2 Aat a right angle as indicated at Ill.' Thus when the elements I4 and It are rotated in a counterdisc representing times from clockwise directionas seen on Figure 5, the angular portion 98 of the cam surface of element ll will engage the angular portion of adiusting arm 22 and will move the lower end of the arm 22 to the left as seen in Figure 2, so as to adjust the thermostatic element 20 in a clockwise direction about its pivot to bring the portion 22 of bracket 2| into engagement with the cam surface 4 j of member 40. It will be understood that as the elements 94 and Sl are rotated the portion ill of arm 22 will first be in contact with the angular edge 96 of element and will then remain in engagement with the left edge of the flanges forming the cam surfaces of elements 24 and Il until it disengages from the opposite end of the cam surface of element i4. With the parts in the position shown in Figures 2 and 4, the arm 22 has just disengaged from the cam surface of element 94. The element I5 has an index marker |02 and the element 94 has an index marker |42 and these markers are used to adjust the elements with respect to the graduations on the disc I2. It will also be understood that when the thermostatic element is automatically rotated in a clockwise direction as described above the instrument is placed on the day setting, as previously described, this setting being manually adjustable by the dial 35. In other words, when the cam surface of element 95 at a point opposite the index marker |02 engages the portion iM of arm 22,

the instrument is placed on the day setting, Thus if the index marker |02 of element Il is adjusted to a position adjacent the numeral i on the shaded half of disc $3, the instrument will go on the day setting at 5 oclock in the morning. The disc 93 is of course properly relatively positioned with respect to the time dial Il so that if the element 95 is adjusted for placing the instrument on the day setting at 5 oclock in the morning as just described, at such time the disc Il and the elements 94 and 95 will have been rotated to such a position that the leading edge of the cam surface of element 9B is just about to engage the portion i0! of arm 22. i,

The position of the element 24 determines the time in the evening when the instrument will go back to the night setting. Thus if the index marker |3 on the element $4 has been placed adjacent the numeral B on the shaded half of the disc Il the instrument will go on the night setting at 9 oclock in the evening. In other words, under these circumstances at 9 oclock in the evening the disc 93 and the elements $4 and il will have been rotated to such a position that the portion |0| of arm 22 is just about to drop oi! the cam surface of element 94.

Referring now to Figure 7 of the drawings wherein I have shownanother modification of my invention, numeral ila designates generally an instrument similar to that of the previous embodiment but incorporating various diiferent features which will now be described. In this figure numeral |24 designates a wall or partition of a building, this wall or partition having an openingv therein forming a recess in which is received a portion lia of the casing housing the dierent parts of the instrument. The other portion |24 of the casing houses the thermostatic mechanism andisdisposedonthesurfaoeofthewallas shown. The portion lia has ears or brackets |2| and |22 which provide for fastening the instru-- ment to the wall by means of screws as shown. 'I'he casing portion lia forms a housingfor the timing mechanism as in the previous embodiment. rlhe timing mechanism comprises generear |25.

-push rod |22 by a coil spring |26.

ally a motor unit Il which is substantially the same as in the previous embodiment and therefore need not be described again. However, in the present embodiment the reciprocable collar 1l is connected to a push rod |23 which extends through an opening in a bracket Ila. Numeral ila designates a piece of insulating material which forms a partition insulating the casing portion Ila from the portion |2a of the instrument. The push rod |22 extends through an opening in the insulating material |9a and engages a pivoted element |24 which is pivoted to an The element |24 is urged against the Integrally formed with the element |24 is a projection or finger |21 which acts as a. pawl in cooperation with the ratchet wheel "a, the ratchet wheel lla being disposed within the casing portion |2a, and there being a portion of the ratchet wheel protruding through an opening in the left wall of the casing portion |2a as shown. The ratchet wheel a is mounted on a shaft which shaft is supported in a bracket |28 upstanding from the lower part of the housing portion |2a. On the shaft i is a bevelled pinion gear |29 which drives another bevelled gear |2$a on a shaft ISI which drives the time dial It corresponding to the time dial of the previous embodiment. 'I'he shaft |2| is supported by a pair of ears |32 and |22 formed integrally with the bracket |28. Half of the ratchet wheel a is shaded at its periphery and the other half is unshaded and it is graduated in the same manner as the time dial Il as shown on Figure 7. Numeral |24 designates a cam driven by the shaft Ill which cooperates with the lower end of the adjusting arm 22a corresponding to that of the previous embodiment, the adjusting arm 22a having an angular portion ill at its lower end similarly to that of the preceding embodiment. The thermostatic element 2l is substantially the same in the present embodiment as in the preceding embodiment and carries an electrical contact blade 23 having a contact 24 cooperable with a fixed contact screw 3| carried by a bracket lla the same as in the previous embodiment. Numeral 25 indicates a rigid backing member for contact blade 24.

The present embodiment operates substantially the same as the preceding form of the. invention, the cam |24 acting to move the adjusting lever 22a so as to adjust the instrument between its day and night settings. The present form of the invention has the advantage of making the apparent size of the instrument no larger than thermostats ofthe ordinary type not employing timing mechanism. In the present form of the invention the timing mechanian is located behind the thermostat itself and is concealed in a recess in the wall so that the casing portion |2a is the only visible part of the instrument and as stated above may have a very small size.

Figures 8 and 9 represent another form of my invention wherein my improved timing mechanlsmisappliedtoadirectreadingtypeofclock. In Figure 8 the timing unit'is disposed within a casing lib having a glass window IIb in the side, the glass being held in place by suitable brackets and screws as shown. 'I'he timing unit is very similar to that of the embodiment of Figures 2, 3 and 4 comprising windings Il and a core I2 including pole pieces and 54. The rotor as indicated at Il drives a worm gear Il mmmtedonashaftlltheshaftllbeingsupported bythe core l2 and asuitable bracket Il! asmaybeseenonligure. Thewormgear Drums in me m are rotatable indicating mechanism.

'averysmalland compactcloc `structed,atiowcilst'.

the lever l" an'd the core I! is l .U-lhDOd lelf.

spring its which must be compressed when lthe collar ligurges the lever'y ill in a clockwise dirilctl'cn about its pivot. Attaches tof the lever m is a pawl IIb 'cooperating lwith and to operate a ratchet ywheel IIb on a ahaftllb. 'In' the present embodiment. as may -be seen.,the abrupt leftward movement of lever l and pawl IIb acts to rotate ratchet wheel b an increment atua time with a snap movement. a tension being ,of course gradually built up in leaf spring i as collar Il moves to the right.

' The motor or the present embodiment has l2 poles and rotates at a speed of revolutions per minute'. The gears lib and IIB have 24 and c 25 teeth, respectively. so that the speed reduction DroducedwillheM X 25or600to Ltha'tisforiio' revolutions of worm Il there will be one revolution relatively of gears b and IIb and one axial cycle of collar 10. It follows therefore that inasmuch as worm gear Il is' rotating l'at a speedl of 80o revolutions per minute there will be one cycle ofcpawl IIb :each minute. In ythe present embodiment ratchet wheel b has 10 teeth so that it will be advanced one increment per minute thereby making one retclutiohin lo minutes.

The time -indicating mechanism is shown'in Fig.

79, this mechanism beine or the speedometer type The timing indicating mechanism includes f similar rotors or drums il! and ili,`drum vill masas-ls Figures l0 and l'l disclose s.v further embodi- 'ment of my invention wherein the timing unit is applied to a clock of a' different type. In Figure ll the clock is shown as having a casing .i ic

with a glass face llc and a back plate I, The v timing unit is very much the same as that ofthe previous embodiment being suitably supported in casing by vscrews and spacing members. as shown. However, in the present embodiment the collar 1I acts on a pivoted lever Ilc which is of a slightly diiferent shape than that of the previous embodiment and is normally biased in a clockwise direction by a coil spring Inc. The lever lite carries a pawl tlc which cooperates withv and 'is arranged to rotate a ratchet wheel Mc. In the present embodiment as shown in Figure ll, knobsc ille and luc are provided for purposes of starting-the timing unit and for adjusting the time indicating mechanism, these knobs being exterior of back plate l, In the present embodiment the ratchet wheel "c is mounted on the shaft llc and it drives a gear train generally in,-

dicated 'at l". Numeral Ill indicates a minute hand carried by a collar ill which is driven at the proper speed by the gear train i". `Numeral i designates an hour hand mounted on the eliaft .1c and which is driven at a speed so that it makes one complete revolution in twelvev hours.

Figures 12 and i3 of the-drawings represent a further modification of my invention wherein I have shown my improved timing mechanism as applied toa time switch. In these figures numeral iid designates a housing for the time switch. the housing having a hinged cover |251 providing access to the interior thereof and which may be secured in closed' position by means of a screw Id. The housing iid has brackets I, III,

. and Ill whereby it maybe mounted on a verti- 1 cal wall.

bearing t'wo series cf numerals ranging from 0 te i 5 on dat faces of the drum, it! bearing numerals from l toil2 on of the drum. drums in and ill thushaving the same.

nimber of dat faced. A

,i onfbift mi and the operating mechanidn for these drums is' such that eachgtime drumill'makefs a revolution drumrlli is advanced one me wheneveftimm mha as there;

.ments (which will of course-reouirefonfe drum l will be advanced one numerals on drums it'land ill which-aref adia-4 1 cent the numeral enum ,ue-'m u e tht.

into registry with wins m, .180.- im window IIb and as will be wir if t the numerals indicate the time in hours In Figures numeral Ill delimited a.i

knob for rotating` the shaft il for'purpoess'of i startingv the electric timing motor. i

actuacion manual nichon hert sie a Y www of adiustlngtnc setting grigi,

The present embodiment of 1lie .coli

` the advantage that becausecf the of "my particular timing motor andthe gear im` The timing motor unit ss is substantially the same as that of previous embodiments, it having 'windings il, a core I2 and a rotor il as previously described. The motor of the present embodiment is of the self starting type as in the first embodiment, there being an armature il within f the windings Il attached to a bell-crank lever tl which in turn is connected to a member it which isy arranged to move vertically in a guide il in the same manner as described inl the first embodiment for imparting an impulse torthe rotor,

d mounted on the shaft 01d. The shaft 31d ii .iourn'alled in bearings formed in brackets .supported by the core l! and its, left end, asseen `in Figure lz, extends lexterior-1y cf the housingV I id and has a knob lud thereon for Purposes of ari-.lasting the position ofthe ratchet wheel as` 'will-*be described. .Mounted cn the shaft sw is s indicating wheel or anne iss Bearing the t`o 12 onv its surface. The shaft lld I n opening or.

windosvin the casing vlid so that one of the numthe' drum is always in registry with the window. Half of the ratchetwheel d is shaded imakes one revolution every twelve hours and the at its periphery and the other half is unshaded and it is graduated in the same manner as the time dial of previous embodiments. Mounted on the shaft 81d to the right oi' the ratchet wheel 86d as seen on Figure 12 are two similar cam elements 94d and 95d. It Will be seen that each formation which is of relatively greater extent than the circular portion of the contour of either cam element alone. Numeral l designates a thumb nut on the shaft 81d adjacent the cam elements 94d and Ild and which can be drawn up so as to tightly secure the cam elements against a collar adjacent the ratchet wheel ltd.

When the thumb nut I ls loosened the cam elements 94d and 95d can be adjusted relatively to each other to vary the angular extent of the cam contour portion of uniform circular conformation produced by the two cam elements together. In other words, the angular distance between the rise on one cam and the drop-oi! on the other can be adjusted. Cooperating with the cam elements d and lid is a cam follower arm 22d which follows out the surface of the cam elements. The other end of the cam follower arm 22d isattached to a shaft lll supported in brackets iis and lil at the bottom of the housing lid. Numeral 58 designates a coil spring on the shaft `55 having one end engaging the bracket Ill and the other end engaging the arm 22d and urging the arm 22d in a direction so that its end follows out the contour of the cam elements. Secured to the other end of the shaft ill isla resilient bracket i5! carrying a mercury switch I".

With the parts in the position shown the cam follower arm is adjacent a portion of one of the cam elements of smaller radius and the shaft Ill and mercury switch i are in a position wherein the mercury switch is open. The cam elements are rotated in a clockwise direction as' seen on Figure 13 and as will be seen, when the cam follower arm 22d follows out the rise on cam element 95d the cam follower arm and shaft lll will be rotated in a counter-clockwise direction so as to tilt the mercury switch Ill and make contact between its electrodes which ar'e at the left end of the mercury switch. The mercury switch will stay in this position while the cam follower arm 22d continues to follow out the contour of both of the cam elements and until it eventually drops ofi' the cam element d whereupon the mercury switch will be returned to the position shown in the drawings. As previously described, the relative duration of times during which the mercury switch is open and closed may be adjusted by manually adjusting the positions of the cam elements Qld and. "d relatively to each other. Obviously, by manually turning the knob lud the drum i5! and ratchet wheel "d may be adjusted to any desired position, it being possible of course to manually actuate the mercury switch in this manner.

From the foregoing descriptions of the various i embodiments of my invention it will be seen by those skilled in the art that I`have provided a novel and improved clock and various timing ar rangements employing it. My improved gear train is advantageous in that it employs only Va but yet providing a very great reduction in speed. For these reasons. by employing my invention a very compact and inexpensive clock may be manufactured and instruments employing timing mechanisms may be built very cheaply and in very compact, neat and convenient forms. As pointed out above, my invention is very nexible in adaptation to thermostats or similar instruments requiring clock mechanisms.

Various forms of my invention which have been disclosed. are representative of some of its species and of applications to which it may be put. Numerous other forms, variations and applications which are within the scope of the invention may occur to those skilled in the art and therefore my invention is not to be limited by my disclosure but only in accordance with the appended claims.

I claim as my invention:

1. In a time controlled thermostat in combination, a casing having a first portion adapted to be mounted in a recess in a wall or the like, timing mechanism in said first portion, said casing having a second portion in front of said first portion, thermostatic means in said second portion, means whereby said timing mechanism adjusts said thermostatic means, said timing mechanism including a reciprocatory member extending between said portions and rotatable means in the second portion operable by said reciprocatory member for adjusting the thermostat at predetermined times.

2. In a time controlled thermostat in combination, a casing having a Portion adapted to be mounted in a recess in a wall or the like, timing mechanism in said portion, said timing mecha; nism including speed reduction means comprising a first rotatable member, a second rotatable member, said first member being reciprocatable longitudinally of its axis, means for rotating said members at different speeds, means associated with said members whereby rotation of said members relatively' to each other reciprocates said first member back and forth in the direction of. itsy axis, an operating member connected with said first member, said casing having another portion in front of said first portion, manually adjustable thermostatic means in said other portions, means whereby said operating member also adjusts said thermostatis means, and manual means for adjusting said thermostatic means, said manual means comprising two rotatable elements having cam surfaces, and an -adjusting lever, said rotatable elements and adjusting lever being so relatively juxtaposed that the end of the adjusting lever lies in the position wherein it may be adjusted from contact with one cam surface into contact with the other cam surface.

3. In a device of the character described, in combination, a base, a thermostat adjustably mounted on said base. control means actuated by said thermostat, said control means being moved between active and inactive positions by said thermostat, a movable arm for adjustins said thermostat, a pair of manual adjustment members for limiting the movement of-said arm to determine two adjustment settings for said thermostat, a cam for moving said arm from one setting to the other at predetermined times, time indicating means moved concurrently with said cam, and a compact motor driven time means for driving said cam and indicating means comprising, a first rotatable member, a second rotatable member, said first rotatable member being very small number of parts and is very compact reciprocatable longitudinally of its axis. sear means for rotating said members at dierent speeds, means associated with said members whereby rotation of said members relatively to each other reciprocates said rst member back and forth in the direction of its axis, and a motion takeoff therefrom connected with said cam and indicating means.

. 4. 1n a time controlled condition responsive device, in combination, a casing having a rst and second portion, a timing mechanism including a reciprocating member located in said first portion, a second portion in said casing located in iront otsaid first portion, a rotatable operating member located in said second portion operably connected to said reciprocating member, an adjustablercondition responsive means located in said second portion for controlling the condition in the space where said device is located at selected diilerent condition values for selected consecutive periods oi time, first manually adjustable means for determining the condition value during each of said consecutive periods of time, second manually adjustable means for determining the duration oi each oi said consecutive time periods, said second manually adjustable means comprising a pair of adjustable cams rotatably controlled by said operating member. and an adjusting lever aiiixed to said condition responsive means and being movable by said second manually adjustable means between a i'irst and second value determined by said ilrst manually adjustable means.

5. In a time controlled condition responsive device, in combination, a timing mechanism including a reciprocating portion operably connected to a rotatable driven member. an adjustable condition responsive means for controlling the condition in the space where said device is located at selected consecutive condition values ilrst manually adjustable members for adjusting the conditionresponsive means to the consecutive condition values. and said adjusting lever cooperating with said second manually adjustable members to move said condition responsive means to a position representing one condition value at the commencement of one time period.

6. In a time controlled condition responsive device, in combination, a timing mechanism including afreciprocating portion operably connected to a rotatable driven member, an adjustable condition responsive means for controlling the condition in the space where said device is located at selected consecutive condition values during selected consecutive periods of time, a first pair of manually rotatable members for selectively indicating the desired condition value during each of two consecutive time periods, a second pair of manually rotatable members having cam surfaces cooperable with each other and with said rotatable driven member tor determining the duration oi each consecutive time period, an adjusting lever cooperating `with said condition responsive means and cooperable with the first of said manually adjustable members for adjusting the condition responsive means to consecutive condition values, said lever cooperating with the second oi said manually adjustable members to move said condition responsive means to a position representing one condition value at the commencement of one time period. and resilient means cooperating with said lever to move said condition during selected consecutive periods oi time. a so responsive means to a position representing a rst pair oi manually rotatable members for se# lectively indicating the desired condition value during each of two consecuuve time periods, said second condition. value at the termination oi said ilrst time period,

i JOHN L.' HARRIS. 

